fix(test): isolate jsdom storage on Node 26

vitest.web.config.ts

@@ -1,5 +1,6 @@
 import tsconfigPaths from 'vite-tsconfig-paths'
 import { defineConfig } from 'vitest/config'
+import { vitestExecArgv } from './vitest.shared.ts'
 
 // Web browser lane: real host entry points, built-client interaction snapshots,
 // and replayed keyless e2e scenarios outside the unit/e2e includes. Linux PR CI
@@ -18,6 +19,7 @@ export default defineConfig({
   // workspace imports to source like every other lane.
   plugins: [tsconfigPaths({ projects: ['./tsconfig.base.json'] })],
   test: {
+    execArgv: vitestExecArgv,
     include: [
       'apps/web/tests/**/*.e2e.ts',
       'apps/web/tests/**/*.snapshot.ts',